The phrase on purpose means deliberately or intentionally. It indicates that an action was done with intention, not by accident.
For example, in the sentence:
"He left the photo out of the story on purpose."
This shows the omission was planned rather than accidental.
William Shakespeare was among the early users of this idiom, demonstrating its longstanding presence in English.
“On purpose” describes actions done with clear intent, highlighting deliberate choices rather than chance or mistake.